In July, 2008, Nine Inch Nails released their album "The Slip" for free, via a CC-BY-NC-SA license. The album was released in multiple formats. This is the highest-quality version: 24bit samples, 96khz, encoded using FLAC.
Artwork included. Note that there's a mistake in the FLAC release artwork as distributed by NIN: 02-1000000.jpg is mistakenly a Photoshop source file. For this release, I have renamed it to .PSB and generated a new 02-1000000.jpg from the source (JPEG at quality 90%).
See http://theslip.nin.com/ for more information and other versions.